E. Procedure
S 013-002
(1)
Open the nose radome (AMM 53-52-01/201).
S 613-003
(2)
Fill the nose radome hinge snubber (Fig. 301).
(a) Remove the fill plug and the gasket from the nose radome hinge snubber.
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A
747-400
MAINTENANCE MANUAL
NOSE RADOME SNUBBER
(UPPER SNUBBER SHOWN, LOWER SNUBBER
ALMOST THE SAME)
Nose Radome Snubber Servicing
Figure 301
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747-400
MAINTENANCE MANUAL
WARNING: DO NOT PERMIT THE HYDRAULIC PRESSURE TO BE MORE THAN 100
_______
PSIG WHEN YOU FILL THE NOSE RADOME SNUBBER.
CAUTION: THE NOSE RADOME SNUBBER MUST BE FILLED WITH MIL-H-5606
_______
HYDRAULIC FLUID ONLY.
(b)
Connect the 95 (|5) psi hydraulic pressure source to the nose radome snubber.
(c)
Fill the nose radome snubber until the piston shaft is fully extended.
S 873-005
(3) Remove air from the nose radome snubber.
(a)
With hydraulic pressure applied, loosen the two bleed plugs.
(b)
Move the nose radome as far as possible until all air is removed from the nose radome snubber.
(c)
Close the two bleed plugs.
(d)
Measure the extension of the piston shaft from the snubber housing.
(e)
Reduce the hydraulic pressure to zero.
(f)
Loosen one bleed plug. Retract piston .07 inch from fully extended position.
NOTE: This permits the hydraulic fluid to become larger
____
because of temperature changes.
(g)
Tighten the bleed plug.
(h)
Install the fill plug and gasket in the nose radome snubber.
(i)
Do the above steps again for the second nose radome snubber.
(j)
Close and open the nose radome to make sure that the nose radome snubbers are operate correctly.
S 413-004
(4) Close the nose radome (Ref 53-52-01/201).
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747-400 MAINTENANCE MANUAL
THRUST REVERSER HYDRAULIC COWL OPENING POWER UNIT - SERVICING
_____________________________________________________________
1. General
_______
A. This procedure services the cowl-opening power unit of the thrust reverser.
TASK 12-12-04-613-001
2. Service the Cowl-Opening Power Unit
___________________________________
A. Equipment
(1) Torque Wrench - commercially available
B. Consumable Materials
(1) D00149 Fluid, Hydraulic, Fire-Resistant Type
IV, BMS 3-11 (AMM 20-30-04)
C. Reference
(1) AMM 54-62-04/401, Forward Fairings
D. Access
(1) Location Zones 415 and 416 Engine 1 - Thrust Reverser Halves 425 and 426 Engine 2 - Thrust Reverser Halves 435 and 436 Engine 3 - Thrust Reverser Halves 445 and 446 Engine 4 - Thrust Reverser Halves
E. Prepare for Servicing of the Power Unit
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